Grenade à Main Of 37, best known under the short name OF 37 (OF means Offensive), is a French hand grenade. It was designed in late 1930s and used by the French army long after WW2 together with similar DF 37 hand grenade. The German Wehrmacht also used captured OF 37s under the name Eihandgranate 302 (f).
Visually OF 37 differs from DF in that the body of OF 37 consists of two parts, while DF 37 has a solid body.